Transmission control



Feb. 28, 1950 T. lAVELLl 2,498,889

TRANSMISSION CONTROL Filed ma 28, 1945 2 Sheets-Sheet 1" L= W INVENTOR.

3 v Tao JQI eZZJZ E r1 Br Feb. 28, 1950 T. lAVELLl 2,498,889

' TRANSMISSION CONTROL Filed May 28, 1945 2 Sheets-Sheet 2 72/70ZlU/aZZgl. BY

WMM

Patented Feb. 28, 1950 TRANSMISSION CONTROL Teno Iavelli, Detroit, Mich,assignor to Chrysler Corporation, Highland Park, Mich., a corporation ofDelaware.

Application May .28, 1945, Serial No. 596,280

This invention relates to control means for a change-speed transmission.More specifically it relates to an arrangement for locking one controlmember against movement for preventing a transmission shift in order topermit a transmission shift through movement of another control member.

An object of the present invention is to provide improvements in theaforesaid arrangement. This may involve the provision of slidable railsmounted in a transmission cover for carrying the control members.

Other objects will appear from the disclosure.

In the drawings:

Fig. 1 is a side elevation of a change-speed transmission Fig. 2 is asectional view taken on the line 22 of Fig. 1;

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is a sectional view taken on the line 4--4'of Fig. 3;

Fig. 5 is a view of a portion of what is shown in Fig. 3, with anactuator added; and

Figs. 6 and '7 are similar to Fig. 5 with the parts in differentpositions.

The reference character [0 designates a transmission casing to which issecured a cover II. The cover has a tubular portion I2 in which ismounted a rockshaft l3, one end of which is noncircular and fits in acorrespondingly shaped opening in a selector !4 clamped to the rockshaft13 by a nut IS. The other end of the rockshaft I3 is of non-circularshape and fits into a correspondingly shaped opening in a lever I6. Therockshaft I3 is upset as indicated at I! to retain lever I6. Thetransmission casing cover II also has a tubular portion I8, in which ismounted a rockshaft I3, having at one end an arm 20, provided with abearing portion 2| fitting in an opening in an actuator 22. The otherend of the rockshaft I9 is non-circular and fits in a correspondinglyshaped opening in a lever 23. The lever is retained on the rockshaft |9by a nut 24. The cover II has a U-shaped projection 25, as viewed inFig. 3, in one leg of which there is a bore containing a coil Spring 26urging a ball 21 against any of three grooves 28, 29, and 30 formed onone end of a rail 3|. In the other leg of the projection 25 is a borecontaining a coil spring 32 like coil spring 26 urging a ball 33 againsteither of grooves 34 and 35 formed on a rail 36. One end of each ofrails 3| and 36 is slidably mounted in a cross bore in a leg of theprojection 25, and the other end is slidably mounted in the base of a U1 Claim. (01. 74- 473) 2 31 secured by the ends of its legs to the coverI and formed integral therewith.

A control member-or shifter fork 38 is secured to the rail 3| and-fitsin embracing relation in a gro0ve.39, formed in a clutching member 40,splined on an output shaft 4 I. When the springurged ball 21engagesgroove 28 in rail 3|, the rail is 50 positioned as to make theclutching member 40 engage a gear not shown, mounted on shaft 4| andconnected indirectly with an input shaft 43 through reduction gears, notshown, and a jack shaft 42. Thus there is indirect drive through thetransmission. When the ball 21 engages the groove on rail 3|, the rail3| is so positioned as to make the clutching member engage a gear notshown, secured on the input shaft 43. Thus there is direct drive throughthe transmission. When, as shown, the ball 21 en gages groove 29 on therail 3|, the rail 3| is so positioned as to make the clutching memberengage nothing, with the exception of the output shaft 4|. Thus thetransmission is in neutral.

A control member or shifter fork 44 is secured to the rail 36 andengages in partially embracing relation a groove 45 in a gear 46,mounted on a shaft 41. When the rail 36 is so positioned that thespring-urged ball 32 engages the groove 35 on the rail 36, the controlmember 44 makes the gear 46 engage both a gear 48 on the jack shaft 42and a gear 49 drivingly connected with the output shaft 4|. Thisestablishes a reverse drive through the transmission. When, as shown inFig. 3, the ball 32 engages the groove 34, the rail 36 is so positionedas to cause the control member 44 to position the gear 46 out ofengagement with the gears 48 and 49, and so the transmission is not inreverse.

The control members 38 and 44 carry projections 50 and 5|, respectively,engaging notches or recesses 52 and 53, respectively, formed in theopposite ends of the actuator 22. The selector I4 has at one side anotch or recess 54 engageable with-the projection 56 on the controlmember 38, and at the other side, a recess engageable with theprojection 5| on the control member 44.

In the position of Fig. 3 the recess 55 of the selector l4 engages theprojection 5| and so prevents shifting of the rail 36 and the controlmember 38, which could result in placing the transmission in reverse byengagement of the gear 46 with gears 48 and 49. Now the transmission maybe shifted'from neutral to forward direct drive or to forwardindirectdrive by angular move- 3 as a pivot effected through appropriate angularmovement or the lever 23. The actuator 22 by engagement with theprojection '50 on the control member 38 brings about the requiredmovement of the control member 38. When it is desired to shift thetransmission to reverse drive, the control member 38 .is returned to.theneutral position of Fig. 3, in'whichtthe projectionfifl is ready toreceive the recess 54 on the selector [4, when it is swung upwardly fromthe positionof Fig. .3 to the position of Fig. 5. After this has beendone, the actuator 22 is moved through thedever about the projection 50on the control member 38 as a pivot. Such movement causes the controlmember 44 and the rail 36 to be shifted because of the engagement of therecess 53 in the actua- .31 and .3B..hav.e straight-line movement withrespect to the cover I]. The control members 3,8

and 4!! have projections .50 :and "5|, which not only are engagedby'notches in an actuator :22

which shifts .the control members to various positions for various driveratios of the transmission,

but also .are engageable with notches in aselec,tor 14 which determines.by engagement with the projection on one shiftcontrol member that theonecontrol memberisiheld against movement and-thatithe other controlmember may be moved .by .the actuator.

I claim:

In .a change speed transmission including -a casing .and "a cover, apair of spaced substantially bar-like rails mounted on the coveriorsubstantially straight line movement substantially parallel to'eachother, a first-control member fixed to one of said rails .for movementtherewith, a second control member 'fixed'to the other of said rails formovement therewith, said control members being movable from a neutralposition to positions establishing predetermined speed ratio driveconditions in the transmission, 'a 'lateral projection on each of-saidcontrol members, "the projection on-said firstcontrol-memberbeing overthe rail to which it is "fixed and the projection on the second "controlmember being transversely offset from the rail to which said secondcontrol member is fixed such that the latter rail is transverselyintermediate said projections, a selector member pivotally mounted onsaid cover intermediate said projections and having a body portionprovided with a pair of opposite sides extendin generallylongitudinally.of said rails, a locking ".nD tCh in each of said ,pair of sides, onenotch adapted to be interengaged with the projection of said firstcontrol member and the other with the projection of said second controlmembe-ruponiswinging movement of said selector in .the direction -of theprojection to be interengaged when said control members respectivelyarer-i-nltheir{neutral positions, said selector being operable to efiectinterengagement of the proiection o'i =s=aid first control member withsaid onenotch whereby to hold this control member against movement out:Of its neutral position to a drive establishingposition .while havingitssaid other notch disengaged from the projection of saidsecond controlmember "to permit movement of the latter'from its neutral-position to adrive establishing position, and said selector being-also operable toefiect "inter-engagement of :the projection of said secondcontrolmeniber-with-the said other notch of ,said selector whereby tohold this control member against-movementout'of its neu- 'tral positionto a drive establishin 'Dosition'while having its said one-notchdisengaged f-romthe projection of said one controlmember to permitmovementof said one control memberfrom-it-s neutral position "to a driveestablishing position, ,an actuator carried by said "cover for pivotal-movement intermediate "said rails, said actuator having opposite slotsone interengaged-with the projection of said "first control -member and'the other with the projection of said second control member, and meansfor operating said actuator, said actuator being adapted to pivot about"the projection of the control --meniber held from movement by saidselector and to actuate for -movement the control member having its projection disengaged from said selector.

T-ENO IAVELLI.

REFERENCES PGITED The following references are of record in the file .ofthis patent:

' .SIDA'I.:ES .l-PAZPENTS gNmnbe-r "Name Date 12271830 Phillips Mar. 31,1942 2,299,889 .Fishburn .Oct. '27, 1942

